我从Orion收到一个ContextUpdate事件，并设置了一个规则来计算接收事件的数字，可能在特定时间窗口内使用相同的“entityId” . 在聚合EPA的派生事件中，我希望“DeviceID”属性假定接收事件的“entityId”的值相同 . 但是，无论是“Deferred”还是“Immediate”评估策略，在消费者输出(文本文件)的DeviceID属性中，我都得到：

“DeviceID”：“[Ljava.lang.Object; @ 4456c43f”

任何提示？

谢谢 .

这是json配置：

{

"epn": {

"events": [{

"name": "DCUPiazzaCarraraContextUpdate",

"createdDate": "Thu Oct 22 2015",

"attributes": [{

"name": "entityId",

"type": "String",

"dimension": 0

}, {

"name": "entityType",

"type": "String",

"dimension": 0

}, {

"name": "battery",

"type": "Double",

"dimension": 0

}, {

"name": "temperature",

"type": "Double",

"dimension": 0

}, {

"name": "stato",

"type": "Boolean",

"dimension": 0

}, {

"name": "rssi",

"type": "Integer",

"dimension": 0

}, {

"name": "lqi",

"type": "Integer",

"dimension": 0

}, {

"name": "timestamp",

"type": "String",

"dimension": 0

}, {

"name": "numprog",

"type": "Integer",

"dimension": 0

}, {

"name": "dcu",

"type": "String",

"dimension": 0

}]

}, {

"name": "DCUAbsence",

"createdDate": "Sat Nov 07 2015",

"attributes": [{

"name": "entityId",

"type": "String",

"dimension": 0

}, {

"name": "entityType",

"type": "String",

"dimension": 0

}, {

"name": "AlertType",

"type": "String",

"dimension": 0

}, {

"name": "eventnum",

"type": "Integer",

"dimension": 0

}, {

"name": "DeviceID",

"type": "String",

"dimension": 0

}, {

"name": "DeviceContext",

"type": "String",

"dimension": 0

}]

}],

"epas": [{

"name": "AbsenceDCU",

"createdDate": "Sat Nov 07 2015",

"epaType": "Aggregate",

"context": "AbsenceDCUComp",

"inputEvents": [{

"name": "DCUPiazzaCarraraContextUpdate",

"consumptionPolicy": "Reuse",

"instanceSelectionPolicy": "First"

}],

"computedVariables": [{

"name": "eventnum",

"aggregationType": "Count",

"DCUPiazzaCarraraContextUpdate": "1"

}],

"evaluationPolicy": "Immediate",

"cardinalityPolicy": "Unrestricted",

"internalSegmentation": [],

"derivedEvents": [{

"name": "DCUAbsence",

"reportParticipants": false,

"expressions": {

"entityId": "\"Alert\"",

"entityType": "\"PiazzaCarrara\"",

"AlertType": "\"006\"",

"eventnum": "eventnum",

"DeviceID": "DCUPiazzaCarraraContextUpdate.entityId",

"DeviceContext": "DCUPiazzaCarraraContextUpdate.entityType"

}

}]

}],

"contexts": {

"temporal": [{

"name": "AbsenceDCUWindow",

"createdDate": "Sat Nov 07 2015",

"type": "TemporalInterval",

"atStartup": false,

"neverEnding": false,

"initiators": [{

"initiatorType": "Event",

"initiatorPolicy": "Ignore",

"name": "DCUPiazzaCarraraContextUpdate"

}],

"terminators": [{

"terminatorType": "RelativeTime",

"terminationType": "Discard",

"relativeTime": "5000"

}]

}],

"segmentation": [{

"name": "AbsenceDCUID",

"createdDate": "Thu Dec 17 2015",

"participantEvents": [{

"name": "DCUPiazzaCarraraContextUpdate",

"expression": "DCUPiazzaCarraraContextUpdate.entityId"

}, {

"name": "DCUAbsence",

"expression": "DCUAbsence.DeviceID"

}]

}],

"composite": [{

"name": "AbsenceDCUComp",

"createdDate": "Thu Dec 17 2015",

"temporalContexts": [{

"name": "AbsenceDCUWindow"

}],

"segmentationContexts": [{

"name": "AbsenceDCUID"

}]

}]

},

"consumers": [{

"name": "OnFileAlert",

"createdDate": "Thu Oct 22 2015",

"type": "File",

"properties": [{

"name": "filename",

"value": "/var/log/tomcat7/Alert.json"

}, {

"name": "formatter",

"value": "json"

}, {

"name": "delimiter",

"value": ";"

}, {

"name": "tagDataSeparator",

"value": "="

}, {

"name": "SendingDelay",

"value": "1000"

}, {

"name": "dateFormat",

"value": "dd/MM/yyyy-HH:mm:ss"

}],

"events": [{

"name": "DCUAbsence"

}, {

"name": "DCUPiazzaCarraraContextUpdate"

}]

}],

"producers": [],

"name": "CounterExample"

}

}